Where the fcuk did you get the totally incorrect idea that "copying small sentences is not relevant enough to be cited"? You're an idiot.
You're likely to get a failing grade, not just lose 9 points. Teachers don't grade on the basis of numbers returned by turnitin, but if you are plagiarizing and not citing, then you can not only fail, but you can be expelled from school.
You need to get a clue, kid.
And, by the way, you need to cite the source of information even if you don't copy it word for word. Even paraphrased information has to be cited.